280 DR. J. MURIE ON THE ORGANIZATION OF THE CAAING WHALE. 
pubo-coccygeus goes to the chevron bones as far as the sixtieth vertebra. Sacro- 
coccygeus, muscular to forty-fifth, tendons to sixtieth; between these points the secon- 
dary tendons which form the sheath, emerge. Supracaudal from fortieth to sixty-sixth 
vertebra; the infracaudal is from two to three vertebre shorter. Longissimus dorsi &c. 
narrows at sixtieth ; two oblique tendons given off at thirty-seventh ; the others behind, 
ere producing aponeurotic sheath. The spinalis dorsi &c., its final tendons inserted 
from the sixty-fourth to the seventieth vertebral diapophyses. 
Fig. 6. 
Spd +Loi 
Id +Lce 
Manner in which the fleshy imbedded inner deep tendons of the longissimus, &c., are distributed to the spine 
in Cetacea, 
Spd+Lei, conjoined spinalis dorsi and levator caudx internus, hooked upwards just posterior to the oblique bridging tendons 
from (Ld+ Lce) the longissimus dorsi and levator caudi externus ; Se, sacro-coecygeus, part of its constituent subsheathing 
tendon also dragged apart. Sketched from a dissection of Phocena communis. 
A series of levatores costarum, of moderate strength, and passing from the transverse 
processes to the ribs, exists in all the species of Whales I have dissected’. 
In the lumbar region of G. melas the intertransversales* are powerful; they diminish 
in strength forwards, and can barely be detected in the most anterior dorsals and 
cervicals. In L. albirostris, whilst fleshy, they are shorter, owing to the close approxi- 
mation of the very numerous and long divergent transverse processes. In P. communis 
caudally they are tendinous; in the lumbar region, semitendinous and fleshy, a superior 
and inferior division is noticeable. 
According to the development of the neural spines, cervical, dorsal, lumbar, and 
caudal, so are the interspinales* strong or weak. But as a series of muscular bundles 
they are, I believe, present in every Cetacean. They have been met with by me in 
five genera. 
Both Rapp‘ and Stannius’ have described in the Porpoise a set of muscles linking 
together the chevron bones. They name these M. interspinales inferiores. They are 
‘ Described also by the oft-quoted German authorities. ? The intertransyersarii of the foregoing. 
* The m. interspinales superiores of the preceding writers. * Op. cit. p. 83. *Z..¢. p. 40: 
